Mold for plastic material.



H. J. KASCH.

MOLD FOR PLASTIC MATERIAL.

APPUCATION mu) MAY 10, 1915.

Patented May 9, 1916.

5 SHEETSSHEET l.

H.1. KASCH.

MOLD FOR PLASTIC MATERIAL.

APPLICATiON FILED MAY 10, I9l5.

Patented May 9,1916.

5 SHEETS-SHEET 2.

H. 1; KASCH.

MOLD FOR PLASTIC MATERIAL.

APPLICATION FILED MAY 10. 1915.

1 182, 1 7 7. Patented May 9, 1916.

5 SHEETSSHEET 3.

I i I I I z ///I G H. J. KASCH.

MOLD FOR PLASTiC MATERIAL.

APPLlCATION FILED MAYLO. 1915.

Patented May 9, 1916.

5 SHEETS-SHEET 5.

SMWIGW y fi" W. wuw

STATES PATENT OFFICE.

HENRY J. KASCE, F IBYINGTOIQ', NEW JERSEY, ASSIGNOR TO THE CHARLESBUBROUGHS 00., OF NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY.

MOLD FOB PLASTIC MATERIAL.

Application filed May 10, 1915.

\ To all whom it may concern:

' Be it known that L'HENRY J. Kason, a citizen of the United States,residing at 53 Florence avenue, Irvington, county of Essex, and State'ofNew Jersey, have invented certain new and useful 1m rovements in Moldsfor Plastic Material, ully described and represented in the followingspecification and the accompanying drawings, :forming a part of thesame.

This invention relates to a press and mold for molding articles ofplastic material which require a core or draw-back piece to form a boreor undercut, projection upon the molded article.

The mold includes a base having a moldblock projected: upwardlytherefrom, and a so-called chase snuglygembracing such moldblock andmovable vertically thereon, and adapted when raised through. a limiteddistance to form a chamber above the moldblock .to receive the moldingmaterial.

7 ed product.

The term core will be used herein to include a core-bar like a. rod formaking a hole through the molded article, or a detach able core-barhaving a portion projected into the mold to undercut a portion of themold- The molded article will, for convenience, be termed a productherein. The core-bar whatever its form, is supported upon the chase sothat when the chase is lifted from the mold-block itlifts the moldedarticle therefrom by the engage ment of the core-bar therewith.

Where a core-bar carries a portion projecting into the mold, to undercutthe prod not, it'requires to be moved laterally to detech it from theproduct, but is held from lateral movement by the chase during themolding operation, and a frame is provided external to the chase, overwhich frame the ends of the core-bar-or bars project;

so that after the chase is raised a limited Specification of LettersPatent.

Patented May 9, 1916.

Serial No. 26,921.

The chase may be pressed normally upward by hydraulic plungers subjectedto constant fluid pressure, such upward movement being limited by anysuitable stop, and such fluid pressure permitting the chase to bepressed downward yieldingly when the upper die is pressed toward themold to compress the material therein.

Where core-bars carry projections to undercut the product and a frame isprovided to lift the core-bars from the chase, the press in which themold is operated may have a connection extended from the platen to theliftingframe, to operateafter the pressing die is raised from the mold,to lift the frame and raise the core-bars from the chase.

The invention is shown in two forms herein, one in which the frame isemployed, and one without the frame in which only the chase is movableupon the mold-blocks. In both, the chase forms the outer sides of themold cavity. The illustrations show two forms of the invention, in bothof which the movable chase is employed, and raised lto lift the corefrom the mold, and serving also to forma cavity for the reception of themolding material.

In the drawing, Figure 1 represents a press with connections foroperating all the attachments of the mold; Fig. 1 shows the under side,and Fig. 1" an edge-view of one of camera head-piece or molded articlesupon a larger scale. Fig. 1 is a plan, and Fig. 1 an edge-view of one ofthe core-bars from the mold. Fig. 2 is a plan of a mold adapted to moldfour head-pieces for a pocket camera, the border of such pieces havingan undercut groove; Fig. 3 is; a section on line 3-3 in Fig. f1; Fig.4is a vertical section on line 44 in Fig. 2; Fig. 5 is an end-view of themold; Fig. 6 is 21 plan of a mold for moldingtwo spools, the mold beingprovided with a-fnovable chase; Fig. 7 is a side-view of the pressin-die for such mold; and Fig. 8 is a section 0 the said mold in sectionon line m-ac in Fig. ,6. Figs.

the press-bed, chase c movable to and from the base, a lifting-frame dencircling the chase, and lifting-rods g movable through the press-bedbeneath the lifting-frame and actuated by a cross-bar G. A die F isattached to the platen for pressing the material in the mold. Thedownward movement f the cross-bar is limited by bolts f exten ed throughthe ends of the press-bed and the cr oss-bar, and the upward movement ofthe cross-bar to raise the lifting-frame is effected by rods E extendedfrom the crossbar through the bed and through the ends of the platen,each having a head or shoulder near its upper end, with which the latchcontacts to lift the cross-bar when he platen is raised to open themold.

In Figs. 2 to 5 inclusive, the base a is shown with four mold-blocks aprojected upward therefrom to mold four similar articles, and havingparallel sides to which the body c and: cross-bars c of the chase arefitted snugly but movably. The top of the chase is formed with atransverse recess to admit a series of core-bars e which are notchedupon their adjacent edges to fit the mold-blocks a, the same as theother por tions of the chase. The ends of the recess 0 embrace the outersides of the group of c0re-bars,-thus holding them firmly in contactwith one nether, as shown in Fig. 2. Thecore-bars arelheld fromend-movement in the recess 0 by dowel-pins 6 Figs. 1 and 1 show thecamera headpiece H formed with a flange 1 around its upper edge, and agroove h in the bodyportion of the head-piece which groove is formed bya rib 6' upon each of the 'corebars 0. If the rib 6 were. formed in thebody of the mold it would wholly prevent the extrication of the moldedarticle therefrom, for which 'reason it is formed upon a core-bar whichmay be lifted from the mold with the molded article and then freelyseparated therefrom. Small hydraulic cylinders I are shown set beneaththe ends of the chase and provided with plungers I and with asupply-pipe J through which fluid is constantly supplied under pressure,thus pushing the chase normally upward. Such upward movement is limitedby a shoulder J.upon a bolt J attached to the base a at each corner ofthe chase, and extended upward through the same.

Fig. 3 shows the parts of the mold with the chase lifted, so that themold-cavities may be charged with material in readiness for the (lie Fto be pressed upon the chase, which forces it downward, and compressingthe material between the working-face of the die and the to s of themold-blocks. Stops a arrest the ownward movement to form the desiredmold-space a. (See Fig. 4:).

The plungers yield under such pressing movement, and at its conclusionthe parts The engagement of r as indicated by the dot ted lines It inFig. 1

it is obvious that the product could not be removed from the mold unlessthe separable core-bars were provided.

Figs. 6 and 8 show a mold in which the core-bar e consists of a roundrod adapted to form a hole through the body of a flanged spool. twospools at once, and the top of each moldblock is formed with acylindrical recess a to form the body of the spool and with deeperrecesses a at the ends of the same to form the flanges.

The' chase is formed to embrace the two mold-blocks a, and is formedwith notches a on a line with the centers of the mold cavities, toreceive core-bars 6 Such a core-bar does not interfere with the liftingof theproduct directly from the mold, and such lifting is effected bythe movement of the chase as shown in Fig. 3; produced when thepressing-die F of Fig. 7 is retracted from the mold, the chase thenrising automatically to the required limit to the position indicated inFig. 8 by the dotted line 6 thus raising the core-bars and drawing thearticle out of the mold sufliciently to be removed by hand with. suchcore-bars. The core-bars forced out of the molded spools.

It will be understood that the cores, before the pressing-die islowered, lie in the recesses of the chase and are thus lifted above thetops of the mold-blocks when the chase is raised, as indicated by thedotted circles e in Fig. 8. As the chase is held thus elevated by thehydraulic plungers I. it is evident that the space inside the chaseabove the top of the mold-blocks a is especially suited to receive ablank of the plastic material of suitable bulk to form the moldedproduct, Such a blank is indicated at-l in Fig. 8', and the core-bar 6can be laid in the notches of the chase above such blank, and is presseddownward into it when the pressing-die F is lowered. Owing to theconstant pressure of the hydraulic plungers I, the downward movement ofthe pressing-die is forcibly resisted, and it therefore makes a. verytight joint with the upper side of the chase in carrying the samedownward, before the die begins to operate upon the blank Z. The chaseis ultimately forced down nearly or quite level with the top of themold-blocks The mold is shown shaped to mold.

are afterward any escape of such material being absolutely preventedduring z molding operation by io making the moldwith "a mpvable chasefitted the pmtio i'ls olithe chase which move downward withflw 'diealong the top edge of the mold-blocks;

' The 0 eration of the chase'is precisel the same in 0th the moldsillustrated; in orming' a molding chamber, and confining the material tosuch chamber, during the advance or downward movement of the press-'ingidiefi Great advantagetlisthus' secured by snugly to and movable-uponthe mold-blocks a, which are shaped to form the lower side of theproduct, the upper side being shaped by the mold-cavities F in thepressing.

die F.

In practice, the mold and pressin' -die for molding plastic material areheate during the pressing operation and then cooled before the discharof the article from the mold, and holes are shown in Fig3'4 to indicatethe circu ation of such heating and cooling fluid; but no connectionsare shown for supplying such fluid, as they are already well known andform no part of the present invention.

Having thus set forth the nature of the invention what is claimed hereinis:

1. In a device for moldinguplastic material, the combination, witha basehaving a plurality of parallel bodied mold-blocks proected upwardlytherefrom, of a chase snugly embracin all of such mold-blocks andmovable vertically thereon, means to limit the movement of he chase,means for raising the chase through such limit, core-bars extendedacross and outside of the chase, a frame movable vertically beneath suchcore-bars, and means for raising the frame to lift the corebars from thechase.

3. In a device for molding plastic material, the combination, with abase having a plurality of parallel bodied mold-blocks projectedupwardly therefrom, of a chase snugly embracin all of such mold-blocksand movable vertically thereon and having a recess adapted to receive aplurality of core-bars, means to limit the movement of the 'chase, meansfor raising the chase through such limit, core-bars fitted to the saidrecess and extehded outside of the chase, a frame movable verticallyabout the chase, and means for raising the frame after the chase islifted to lift the core-bars from the said recess.

4. In a press and mold for molding plastic material, the combination,with a pressbed, of a platen carrying a pressing-die, a mold having abase with a plurality of parallel bodied mold-blocks projected upwardlytherefrom, a chase snugly embracing all of such mold-blocks and movablevertically thereon, and having'a recess adapted to receive a pluralityof core-bars, means to limit the movement of the chase, means forraising the chase through such limit, core-bars fitted to the saidrecess and extended outside of the chase, a frame movable verticallybeneath the ends of the core-bars, a cross-bar beneath the ress-bed withrods extended through the ed to the frame, and means connectin thecrbss-bar with the platen, operating t lift the frame when the platenraises the pressing-die from the mold, whereby the core-bars are liftedfrom the moldblocks by the chase and are, themselves,

lifted from the chase b the frame.

In testimonywhereo I have hereunto set my hand.

HENRY J. KAsoH.

